1. gdb调试打开方式

1.直接打开

gdb main

2.先进入再打开

hsm:Templates/ $ gdb                                           [9:37:48]
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(gdb) file main
Reading symbols from main...

3.打开的同时,不显示版本等信息

gdb -q main

2. 运行

• run (r)
  作用是运行程序,当遇到断点的时候,停止运行,等待下一步命令
• continue (c)
  继续执行,到下一个断点处(或运行结束)
• next
  单步跟踪程序,当遇到函数调用的时候,不会进入函数体
• step
  单步跟踪程序,当遇到函数调用的时候,会进入函数体

disas

• disas main
  反汇编

Dump of assembler code for function main:
   0x0000000000001139 <+0>:    push   %rbp
   0x000000000000113a <+1>:    mov    %rsp,%rbp
   0x000000000000113d <+4>:    sub    $0x10,%rsp
   0x0000000000001141 <+8>:    mov    %edi,-0x4(%rbp)
   0x0000000000001144 <+11>:    mov    %rsi,-0x10(%rbp)
   0x0000000000001148 <+15>:    lea    0xeb5(%rip),%rdi        # 0x2004
   0x000000000000114f <+22>:    mov    $0x0,%eax
   0x0000000000001154 <+27>:    callq  0x1030 <printf@plt>
   0x0000000000001159 <+32>:    mov    $0x0,%eax
   0x000000000000115e <+37>:    leaveq 
   0x000000000000115f <+38>:    retq   
End of assembler dump.

3. 断点

• break n
  在第n行设置断点
• break func
  在函数gunc()的入口处设置断点
• delete n
  删除第n个断点
• disable
  暂停第n行的断点
• enable
  开启第n个断点
• clear n
  清除第n行的断点
• info b
  显示当前程序的断点设置情况
• delete breakpoints
  删除所有断点

4. info

可以查看比如内存,函数,栈等信息

比如

• info functions

(gdb) info functions 
All defined functions:

File main.c:
2:int main(int, char **);

Non-debugging symbols:
0x0000000000001000  _init
0x0000000000001030  printf@plt
0x0000000000001040  _start
0x0000000000001070  deregister_tm_clones
0x00000000000010a0  register_tm_clones
0x00000000000010e0  __do_global_dtors_aux
0x0000000000001130  frame_dummy
0x0000000000001160  __libc_csu_init
0x00000000000011d0  __libc_csu_fini
0x00000000000011d8  _fini
(gdb)

5. 退出

(gdb) quit